NIMDO-Based Verification Test Method for Time Server Products
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摘要: 为满足生产制造厂家在时间服务产品的设计开发、产品定型、出厂检验等过程中对高精度关键指标测试检验的需要,基于同步至UTC(NIM)时间频率源—NIMDO的远程实时溯源,设计了高精度的时间服务器产品性能验证测试方法。对采用逐步取模补偿的晶振驯服算法的时间服务器进行测试,当使用不同性能的GNSS接收模块A和B作为外部参考时间源时,利用设计的测试方法得到时间服务器与NIMDO的平均时间偏差分别为8.6 ns和2.8 ns,符合产品系列化标准型和高端型关键指标要求。Abstract: To meet the needs of manufacturers in the design and development of time service products, product finalization, factory inspection, and other processes on high-precision key indicators test inspection, a high-precision time server product performance verification test method is designed based on synchronization to UTC (NIM) time-frequency source, that is, the remote real-time traceability of NIMDO. By testing the time server using the crystal discipline algorithm with stepwise modulo operation compensation, when using different performance GNSS receiver modules A and B as external reference time sources, the average time deviation of the time server from NIMDO is 8.6 ns and 2.8 ns respectively using the designed test method, which meets the requirements of the key indicators of the product seriation in both standard type and high-end type.
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Key words:
- time frequency /
- NIMDO /
- real-time traceability /
- high-precision /
- discipline algorithm /
- time server
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表 1 时间偏差数据统计
Table 1. Statistics of time deviation data
观测站(REF) 观测点数 0 ns < |**|
< 5 ns5 ns < |**|
< 10 ns10 ns < |**|
< 15 ns15 ns < |**|
< 20 ns|**|
> 20 nsTS23 34613 32564 559 370 2 1118 百分比 94.08% 1.62% 1.07% 0.01% 3.23% 表 2 相对频率偏差数据统计
Table 2. Statistics of relative frequency deviation data
观测站(REF) 观测点数 0 < |**|
< 5×10−145×10−14 < |**|
< 1×10−131×10−13 < |**|
< 2×10−13|**|
> 2×10−13TS23 404 338 56 8 2 百分比 83.66% 13.86% 1.98% 0.50% -
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